Roof pipe penetration details showing a structural support passing through an OSB or plywood deck with a minimum eight-inch clearance. The assembly includes a new sixty mil TPO single-ply membrane mechanically attached over quarter-inch Securock, with TPO flashing membrane hot-air welded and sealed with a stainless steel hose clamp, aluminum tape, and one hundred percent urethane sealant. A twenty-four gauge galvanized iron hood sits over pourable sealer and grout, supported by a metal base plate tied back to structural drawings.
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